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what actually a warden service is and how it works. |
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The warden is a process that makes sure all MapR processes are running and configured correctly. |
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Warden is a service running on a node acting as a watch dog for other services. Warden takes care of start/stop/restart of all configured services on a node. For example if a node is configured to run FileServer, TaskTracker and RegionServer, Warden is the one who takes care of starting them and in case of failure of one of them, it can restart it automatically upto configured number of times. Warden itself is configured to run on a node startup. One can stop start warden using init.d scripts or service command. If you want to configure how warden works this might be useful http://mapr.com/doc/display/MapR/warden.conf |
